When light propagates through a material medium of relative permittivity $\varepsilon $r and relative permeability $\mu$r, the velocity of light, v is given by (c-velocity of light in vacuum)

Question

When light propagates through a material medium of relative permittivity $\varepsilon $_r and relative permeability $\mu$_r, the velocity of light, v is given by (c-velocity of light in vacuum)

v = c

$v = \sqrt {{{{\mu _r}} \over {{\varepsilon _r}}}} $

$v = \sqrt {{{{\varepsilon _r}} \over {{\mu _r}}}} $

$v = {c \over {\sqrt {{\varepsilon _r}{\mu _r}} }}$

Solution

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